Truck-hoist



J. NEWTON.

TRUCK HOIST.

APPLICATION FILED JULY 8.1919.

Patented Oct. 26, 1920.

3 SHEETS-SHEET 1- IN VEN TOR JOHN NEWTON. B M D LIL E. 41

ATTORNEY Patented Oct. 26, 1920.

3 SHYEETSS'NEET 2.

w N a mm v a. S Q m H a mm 0% .n j: V o a @N m Z a U r Q 3 \wn q -||T||\| m mm Q INVENTQR JOHN NE W10 W ATTORNEK J. NEWTON.

TRUCK HOIST.

APPLICATION FILED JULY 8,1919.

'- J. NEWTON.

TRUCK HOIS T.

APPLICATION FILED JULY 8.1919- m m n 9& Mm v. 1T T. E 6 m W M 24 WM 0 M t M 3 m J e P n A I 0 8 .4 4 4 4 UNITED STATES PATENT OFFICE.

JOHN NEWTON, OF SAN FRANCISCO, CALIFORNIA.

TRUCK-HOIST.

Specification of Letters Patent.

Patented Oct. 26, 1920.

Application filed July 8, 1919. Serial No. 309,496.

- new and useful Truck-Hoist, of which the following is a specification in such full and clear terms as will enable those skilled in the art to construct and use the same.

This invention relates to a truck hoist adapted for use with automobile trucks in which a dumping body is used, the power for raising the body being supplied from the engine. I

An object of the invention is to provide a truck hoist which is capable of raising the body and automatically stopping it and the raising mechanism in the raised position; but which is also provided with means whereby the mechanism will not be injured should the operator fail to stop the raising mechanism or should the automatic stop fail to operate.

It will be understood by those skilled in the art that with careless drivers that frequently the safe-guards provided for the operation of such apparatus will not prevent accidents which seriously injure the entire apparatus.

In the present instance, the apparatus is r so constructed that even though the driver does not operate it as intended, that there will be no danger of injury to the apparatus since the only thing that can happenwill be that the dumping body willbe raised and again lowered, and should the apparatus not be stopped, it will be again raised and lowered until the engine is stopped.

Another object ofthe apparatus is to provide means whereby the apparatus may be stopped at any desired point, the hoisting apparatus being operated by a worm of very flat pitch so that it can not be driven backwardly from the worm wheel drive.

Other obj ects'of the invention will'appear as the description proceeds.

An embodiment of the invention is shown in the accompanying drawings in which the same reference numeral is applied to the same portion throughout, but I am aware that there may be modifications thereof.

Figure 1 is a side elevation of a truck having this hoist applied thereto,

Fig. 2 is a view partly in section of the shifting rod for engaging and disengaging the clutch for operating the hoist,

Figs. 3 and 4: are a side elevation and front view respectively of one of the arms for raising the truck body, Fig. 5 is a plan view of the body shown in dotted lines,

Fig. 6 is a rear elevation of the truck showing the means for driving the hoistlng' apparatus,

Fig. 7 is a view on a larger scale than the truck with the preceding figures of the clutch shifter lever in side elevation,

Fig. 8 is a view of the hoisting apparatus in side elevation with the gear case shown in section,

Fig. 9 is a transverse sectional view through the gear case of the hoisting apparatus,

Fig. 10 is a view of'the gear case of the hoisting apparatus looking from the front of the truck, and

Fig. 11 is a view of a portion of the change gear box showing the gears which drive the hoist and omitting the remaining gears which drive the truck.

The numerals 1 to 4: inclusive indicate the wheels of the truck, 5 and 6 axles, 7 the engine, 8 the tube through which the drive shaft extends from the gear box '9 to the rear axle. The gear box is of a well known type in which the engine shaft carries a gear 1O withsuitable clutch teeth for driving the truck, and the gear is in mesh with a gear 11 on the counter shaft 12.

In practice, since this hoist is usually applied to truck's after they are built, it is commonfor the shaft 12 to be inserted after the completion of the truck, and to take the place of a shorter shaft which does not extend outside the gear box. In the present instance, the shaft 12 extends far enough beyond the gear box 9 to receive a sliding clutch collar 13 and a loose sprocket wheel 14: which has teeth to engage the clutch collar 13. The engine and gear case are supported inany suitable frame, as indicated at 15, which frame is provided with cross braces 16, 17, 18 and with end cross braces .19 and 20. The frame is carried by suitable springs 24 and 25 at the front and rear respectively.

The engine proper is supported by two longitudinally extending braces 21, 22.

The mechanism for hoisting the automo bile body comprises the shaft 26 whichis mountedinboxes27,28 onthe side members of the main frame 15. This shaft has arms 29,

.30 at its end, which arms are rigidly connected to the heavy bosses 31 which are mounted upon the ends of the shaft 26. The arms 29, 30 are pivotally connected by means of suitable pins to the ends of two links 32, 33, which links are in turn pivotally connected to two brackets 34, 35 on the underside of the truck body 36, said body being provided with depending brackets 37, 38 by which it is pivotally connected to the rear of the truck frame.

The shaft 26 extends through a gear box 40, which gear box has a movable cover 41 and which is provided with lugs 42, 43 to connect it to the cross frame members 17, 18. WVithin the gear box, the shaft 26 carries a worm wheel 44 which worm wheel is in mesh with a worm 45 at its lowest point, the object being to provide suitable lubrication for the worm and its worm wheel; and on account of the high pressure of the worm wheel upon the worm, the worm shaft 46 is provided with a ball thrust bearing 47 This worm shaft 46 is also provided with a-gear 48 in mesh with a smaller gear 49 on the shaft 50 which shaft extends from the gear box 40 to the bearing 51 on the cross frame member 16. This shaft is provided with a sprocket wheel 52 around which sprocket wheel the chain 53 passes, said, chain also passing around the sprocket wheel 14.

In practice, the worm 45 is made of a very flat pitch so as to give the greatest power in elevating the truck body from its position of rest upon the seat frame to the required inclination for dumping the materials carried thereby upon the ground.

Onone of the longitudinally extending side members of the frame 15, there is a rectangular frame 56 which pivotallysupports the shifting lever 57 5 said lever being'connected thereto by means of the bolt 58. This lever has a fork 59 which embraces the clutch collar 13 and it has a slot 60 through which the shifting rod 61 passes. The shifting rod is supported upon the frame 56 and it has two collars 62, 63 thereon, which shift the lever 57 in either direction as may be required. The rod'61 has a handle projecting for the convenience of the operator as indicated at 64, and at its opposite end it is provided with an arm 65 which arm is engaged by either of the cams 66 or 67 to cause it to disengage the clutch 13. In order to prevent injury to the apparatus should the cams 66 or 67 be rotated in the reverse direction, or get caught in any way by the arm 65, said cams are each provided with a spring as indicated at 69, 70 so that while they can disengage the clutch 13, they cannot be operated to engage said clutch. The rod 61 is also provided with an arm 71 which has a spring 72 connected to the cross frame member 17, the object being to normally hold the arm 65 in the path of the cams 66, 67. However, when it is desired to start the hoist, all that is necessary for the operator to do is to take hold of the handle 64 and turn it until the arm 65 will pass the spring 69 or 70, and then shift said rod 61 until the clutch 13 engages the sprocket wheel 14, and if the engine is run-, ning, the hoist will operate either to lower or to raise the body as the case may be.

The two cams 66, 67 may be set at any desired angle upon the shaft 26 so that they will stop the hoist either when the body is up or when it is down as may be desired.

In operation, the driver turns the rod. 61 until the arm 65 passes the springs 69 or 70 and then shifts the clutch 13 into engagement with the sprocket wheel 14. This will drive the chain 53 and will cause the shaft 26 to rotate; whereupon the arms at the sides of the truck body will lift it, and in due time one of the cams 66 or 67 will cause the hoist operation to cease by shifting the rod 61 so that the clutch 13 will be disengaged from the sprocket wheel 14. Thereupon the rod 61 may be again operated to rengage the clutch 13 and sprocketwheel 14 to restore the body to its initial position.

It will be observed that if the hoisting apparatus is not stopped when it should stop, that no damage will be incurred in the slightest degree, since the links 29, 30 can rotate through a complete circle and their only effect will be to restore the body to its initial position; or if then the hoist cannot be stopped, to again'raise it.

\Vhat I claim is as follows, but various modifications may be made in the construction shown in the drawings and above particularly' described form, within the purview of my invention.

1. The combination of a vehicle frame, a dumping body thereon, links depending from the body, arms connected with the links, a shaft capable of a complete rotation carrying the arms, a worm gear and a worm for rotating said shaft, means for automatically stopping said rotation at the end of each half rotation a slidable rod for engaging the lifting means with a suitable power shaft, said rod also being capable of being rotated to pass the stopping mechanism when the power is to be applied.

2. The combination of a vehicle frame, a dumping body thereon, links depending therefrom, armsto which the links are connected, a shaft capable of complete rotation to which the arms are connected, a'worm wheel on the shaft, a worm for rotating said wheel, cams on the shaft, and means engaged by said cams for stopping the rotation of the shaft upon each half revolution.

3. A truck hoist comprising a vehicle frame, a dumping body thereon, links defor engaging the clutch, and cams on the pending from the body, arms connected to Worm Wheel shaft for stopping the movethe links, a shaft capable of complete roment of said shaft on each half revolution 10 'tation carrying the arms, a Worm wheel on thereof.

5 the shaft, a Worm in engagement with the In testimony whereof I have hereunto set Wheel, a clutch, shafts and gearing conmy hand this 20th day of June, A. D. 1919. necting the clutch With the Worm, a handle JOHN NEWTON. 

